Thanks dave@ for the suggestion and Rohan Jain for the patch.

Clearer explanation when exception has no message

Thanks Carl for the suggestion and David Cramer for the patch.

Thanks Gavin Wahl.

Thanks weipin for the report and Baptiste Mispelon for the patch.

Correctly calculate the ``aggregate_start`` offset from loaded fields,
if any are deferred, instead of ``self.query.select`` which includes all
fields on the model.

Also made some PEP 8 fixes.

Chicago was missing.

Refs #15653.

Thanks Edwin.

Thanks mbertheau for the report and Ash Christopher for the
initial patch.

Thanks jcumbo@ for the report and adamzap
and nott for the patch.

Thanks nott.

Thanks wiml@.

GenericIPAddressField must not allow blank for NOT NULL fields

Thanks Erik Romijn.

Issue was fixed by removal of chunked reads from
QuerySet iteration in 70679243.

Thanks Simeon Visser for the patch.

Thanks sane4ka.sh@ for the report.

Thanks Deepak Thukral for the patch.

Thanks seddonym.

The cause was assuming that an unordered queryset returns the values
always in the same order.

The ``DocTestRunner`` and ``OutputChecker`` were formerly in
``django.test.testcases``, now they are in ``django.test.simple``. This avoids
triggering the ``django.test._doctest`` deprecation message with any import
from ``django.test``. Since these utility classes are undocumented internal
API, they can be moved without a separate deprecation process.

Also removed the deprecation warnings specific to these classes, as they are
now covered by the module-level warning in ``django.test.simple``.

Thanks Anssi for the report.

Refs #17365.

Thanks Aymeric Augustin for reporting

Thanks Benjie Chen.

Thank-you Martin Green for the patch.

Thanks wilfred@, poirier, and charettes for work
on the patch.

Fixed #20505 -- Typo in BinaryField documentation.

Thanks simon@ for the suggestion and JordanPowell
for the initial patch.

MySQL should work now, too.

Thanks master' for the report and Niels van Dijk for the fix

The SubqueryConstraint defined relabeled_clone(), but that was never
called. Instead there is now clone() and relabel_aliases() methods for
SubqueryConstraint.

A related problem was that SubqueryConstraint didn't correctly use
quote_name_unless_alias() of the outer query. This resulted in failures
when running under PostgreSQL.

Fixed #20506 - Typo in transactions docs.

Fixed #20443 -- Import errors in settings cause confusing error messages